Defining custom domain as `https://example.com/` is invalid.
It should be just the domain, just `example.com`. But turns out a lot of
our users have the incorrect configuration, and our previous stack of
NGINX+Certbot was able to ignore this and serve without HTTPS. This PR
brings that behaviour back.
## Test performed
Have Appsmith running on an EC2 instance, and a domain `correct.com`
with an A-record pointed to this EC2 instance.
In the instance, we run Appsmith with `APPSMITH_CUSTOM_DOMAIN` set to
`wrong.com`. Caddy will obviously fail to provision the cert, and so we
expect it to accept connections on just HTTP.
So hitting `curl -i http://correct.com` produced a 200 with the HTML
response, and not a 308 with a redirect. Before the changes from this
PR, the same curl command produced a 308 with a redirect to
`https://correct.com`, which fails with a certificate error.
Next up, we run Appsmith with `APPSMITH_CUSTOM_DOMAIN` set to
`correct.com`. Caddy will succeed in provisioning a cert, and so we
expect HTTP URLs to be redirected to HTTPS.
So hitting `curl -i http://correct.com` produces a 308 redirect to
`http://correct.com` which then works fine, since Caddy now has the cert
for the domain.
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